Boeing [BA] recently secured a $1.5 billion Army contract to refurbish another 117 AH-64 Apache attack helicopters to the most up-to-date E-model configuration.

The deal is a continuation of an ongoing effort by the Army to upgrade 690 AH-64D Apache Longbows to AH-64Es. Also included are acquisition of Longbow crew training devices, logistical support and spare parts. Boeing now has 290 of the total number of aircraft slated for remanufacturing under contract.

“The AH-64E Apache continues to meet the requirements of aviators, battlefield commanders and soldiers deployed on missions worldwide,” Col. Jeff Hager, the Army’s Apache project manager, said in a statement. “The Army, Boeing and Team Apache suppliers continue a valuable collaboration that ensures soldiers have the latest technologies to succeed in defending freedom with this outstanding weapons system.”

The agreement modifies an existing contact between Boeing and the Army for the full-rate production of lots 5 and 6 Apache helicopters. The Army will return 117 AH-64D Apaches to Boeing’s Mesa, Ariz., production center to be remanufactured into the AH-64E configuration.

Longbow Apaches that will undergo the transformation are operational attack aircraft currently in the Army’s fleet, according to Boeing. The same model was used by Boeing and the Army to transition the AH-64A to the AH-64D Apache Longbow beginning in 1997.

“With our integrated production, services and training teams, Boeing is able to affordably support the Army through each phase of the Apache’s lifecycle,” said Kim Smith, Boeing’s vice president of attack helicopter programs. “The dedication and commitment to first-time quality by Boeing teammates and suppliers combine to deliver an Apache that is ready to meet the rigorous demands of the men and women who depend on it.”